u6 



THE SUPERIOR EXTREMITY 



the arm, and (2) and (3) the dorsal cutaneous nerves of the 

 forearm. 



The muscular branches are distributed to the three heads 



Spine of scapula Suprascapular nerve 

 Transverse scapular artery | | 



Infraspinatus 

 Circumflex, scap. 

 artery (O.T.) 

 clorsalis scap. 

 Teres minor 



Subscapularis 



Teres major 



Triang. space 

 Quadrangular space 



Triceps, long, head 

 Radial nerve (O.T. musculo-spiral) 



Brachial artery 

 Triceps, lateral head 



N. to triceps, medial head - - 



Ulnar nerve 

 Medial epicondyle -- 



N. to flex. carp. uln. 



Olecranon J 



Subacromial bursa 



Jnfraspinatus muscle 

 Capsule of shoulder- 

 joint 

 N. to m. teres minor 



. Deltoid 



Axillary nerve 

 (sup. branch) 

 Axillary nerve 

 (inf. branch) 



Lateral brachial 

 cutaneous nerve 



- Lateral head of triceps 



Radial nerve (O.T. 

 musculo-spiral) 



Ant. branch of profunda 

 artery of arm 



Post, branch of profunda 

 artery of arm 

 Dorsal antibrachial 

 cutaneous nerve 



Brachialis 



Lateral epicondyle 

 Recurrent inter- 

 osseous artery 



Anconseus 

 Ext. dig. comm. 

 and dig. quint. 

 Ext. carpi ulnaris 



FiG. 49. Dissection of the dorsal aspect of the Arm. The lateral head of 

 the Triceps has been divided and turned aside to expose the sulcus on 

 the Humerus for the radial nerve. 



of the triceps, to the anconaeus, to the lateral fibres of the 

 brachialis, to the brachio-radialis, and to the extensor carpi 

 radialis longus. The branches to the three last-named 

 muscles spring from the trunk of the nerve after it has 



